Indicating and locking device for change-gear mechanism.



PATENTED MAE. 19, 1907. B. M. W. BENSON. INDIGATING AND LOOKING DEVICEEOE CHANGE GEAR MEGHANIS APPLICATION FILED JULY l1, 1906.

www

[lz velz t0n' Mil/95128012 y Aitarzzey,

wa/HE. f Mmm VUNITED sTATEs PATENT OFFICEP RENGT M. W. lHANsON, OFHARTFORD, CONNECTICUT, AssIG'NOR TO PRATT a WHITNEY COMPANY, orHARTFORD, CONNECTICUT, A CORPORATION OF NEW JERSEY.l

INDICATING'AND LooKlNe DEVICE Fon CHANGE-GEAR mEcHANlsiwl.

Patented March 19, 1907.'

To afZZ whomir'/ may concern:

Be it known that I, BENGT M. W. HANSON,

a citizen of Sweden, residing at Hartford, in the county of Hartford andState of Connecticut, have' invented certain newand useful Improvementsin Indicating and Locking Devices for Change-Gear Mechanism, of thefollowing is a specification.

This invention relates to change gear mechanism for lathes and othermachines, andhas for its object' the provision of improvements in themeans em loyed for indicating the number of teeth o the gear of the conewith which theshiftable pinion is engaged.

A further object of the invention is the which provision, in connectionwith the indicatin means above mentioned, of an improve locking devicefor the shiftable pinion.

Other obj ects of the invention will be found disclosed in the detaileddescription.

In the accompanying drawings, Figure 1 is a side elevation of partl ofan engine-lathe,

`showing my improvement employed therewith. l Fig. 2 is a longitudinalvertical section of Fig. 1, illustrating one kind of variable-speedgearing with which the invention may be employed. Fig. 3 is a plan viewof the sleeve., barrel-pinion, and lever in bearings of which theAshiftable idler-.pinion hereinafter described is journaled. Figs. 4 and5 are transverse sections each taken on line 4 4 of Fig. 1 and showingdifferent positions of Re erring 'to the drawings, the numeral 1indicates a hood or gear-box for containin thefvariablespeed mechanism,said hoo projecting from the framein a well-known manner and being cutaway in front at 2 to disclose certain ,features of the gearing.

In bearings 3 and 4 of the gear-box isjournaled a shaft 5, carryingsplined thereto a cone-train composed of gears 6 to 17, inclusive, and apinion 18 in mesh with agear 19, rigid with a shaft 20, which may be thelead-screw shaft of the lathe.

Mounted in bearin s 21 and 22, fitted in openings in the ends o thegear-box, is a shaft 23, provided with a long pinion 24 interme-Animation meaiuiy 11,1906. sex-lamaszaov.

diate its journals and surrounding said pinion, and located betweenshoulders of the bearin s is a sleeve 25, having a wide lonnitudinallslot 26 and a longitudinal groove fbr the reception of a spline 27,Figs. 4 and 5, y

carried by the hub 28 of an arm or lever 29, passin at its free endthrough the opening 2 in sai gear-box. Journalecl in bearings 30 oflever 29 is a short shaft 31, having rigidly secured thereto anidler-gear 32 in constant intermeshing engagement with the pinion 24,said idler-gear entering the slots 28 of hub 28 and 26 of sleeve 25. Atits end opposite the hub 28 the lever-arm 29 is provided with a tubularbearing 33, having a notch 34 in one of its walls, said bearingreceiving a'plunger 35, having a recess 36 in its inner end'and a stem36 passing through a perforation in the outer end of the bearing andequipped eX- terior to said outer end with a knob 37. A spring 38encircles the stem 36 between the head of the plunger theinner wall ofthe end of the bearing and normally tends to force said plunger inward,as shown in Fig. 5.

Designated in a general way by 39 is a preferably curved row ofseparated and removable indicating-pins, (shown enlarged in Fig. 6,)said pins serving the following purpose-viz., to indicate the number ofteeth in the gear of the cone with which the idlergear 23 is engaged.For instance, ifithe gear 6 of the cone has eighty teeth the first pinwill be marked 80, and if the. gear 7 has seventy-two teeth the secondpin will receive the same number, and so on throughout the series ofpins, thus providing a visible index which,in connection with the usualchartplate, will enable the necessary calculations always necessary inthe class of machines to lwhich the invention relates to be made withreadiness and despatch.

In virtue of the notch or slot 34 in the inner end of the bearing 33 itwill be seen that the lever-arm 29 cannot be swung upward until saidnotch is in position-.to receive the selected pin, and thu's to engagethe idlern ar 32 with the desired gear of the cone hav- Ing the numberof teeth indicated on said selected pin, when the knob 37 will bereleased, the lunger will snap forward, and the recess in t e headthereof will immediately receive the pin and lock the parts in theposition required.

While the invention is shown vapplied to'a IOO lathe of the kind setforth in my patent dated July 18, 1905, No. 795,222, it is distinctly tobe understood that the invention is of general application and is notlimited to any special arrangement ot change-gear mechanism.A

ln the operation of the invention when for any reason it is desired tochange the speed of the shaft 2() the knob 37 is grasped to Withdraw theplunger 35 against the stress ot spring 38, and the lever-arm29 is thenmoved upward and shifted longitudinally ot the gear-box 1 until thenotch 34 comes into line' with and receives the pin selected, when theknob is released and the spring immediately causes the plunger-head toengage said pin and lock the lever and the parts shiftable therewithsecurely in place.

Changes may be made in many of the constructional details ot theinvention without departure. therefrom, and it may be employed withvarious locking devices and systems ot change-gearing ditterent fromthose shown;

Having thus described the invention, what I claim is- 1. ln` change-gearmechanism, the combination, with variable-speed gearing, of a pinionadapted to be engaged with any member of said gearing; means forshifting said pinion; and a series of pins or projections each marked to.indicate the number of teeth in the change-gear with which itcooperates; and means cooperating with the pins for locking theshiftable pinion after it has been engaged with the selected gear.

2. The combination, with variable-speed mechanism and with an idleradapted to be engaged with any member of. said mechanism, of means forrotating the idler; means Jfor shifting said idler; a series of pinseach having an indicating-mark; and a device carried by the frame of theshiftable idler, and coperating with said pins to lock the parts whenthe idler is moved into engagement with a selected gear.

, 3. The combination, with a gear-cone, of a` driving-pinion; ashiftable idler actuated by said pinion; a series of pins, each markedto indicate the number of teeth of the gear ele- `ment with which itcooperates; an means carried by the trame of the idler, and adapted tosecure said frame when shifted to the ,p'oint selected.

cone; a series of pins cooperating with said gcar-cone, and each pinhaving a mark to indicate the number of teeth in the. element et saidgear-cone with which it eoaets: a driving-pinioil; a frame. shiitablealong and movable over said. driving-pinion; an idler carried hy thetrame, and means also carried by the trame7 and adapted to engage anyel: said series ot pins.

6. lin speed mechanism,theeombination, with a trame, ot a series ol`separat ed pins earried by the trame in which said mechanism is mounted,each pin having a numeral thereon to indicate the number ol' teeth inthe elements ot the speed mechanism with whieh the pins Cooperate.

7. The combimttion, with a gear-boxA and with a shaft iournaled therein;et a gear-eolie; a driven pinion also journaled in the gearbox; an idlerin engagement with said driven pinion: means tor shitting the idler toeause it to engage any element ol" the. geant-one: a series ot pins,each having a mark to indieat e the number ot teeth in the. element ol`the gear-cone with which it cooperates: means Jfor engaging the pins,and thus locking the idler.

S. The combination, with haimwverk, and with a series of sepa ated pins,each bearing an indicating mark, rigid with said l'rame` of'variable-speed gearing; a shiltable idler adapted to engage anyelen'ient oli said vari-- able-speed gearing; means tor engaging any ofthe pins, and tlms locking the idler when shifted; and means tor drivingthe idler.

9. The combination, with a shift able idler, ot a device carrying saididler, and baring a notched bearing; a spring-actualed plunger in saidbearing, said plunger having a seat; a series ot pins with any ot' whichthe seat oll the plunger may be made to engage: and variable-speedgearing cooperating with the idler.

10. The coml'iination, with a lever-arm comprising a bearing, of adriven pinion over which said arm is shiftable; a spring-actnatedplunger in said bearing; the. head ot said plunger having a seat; anidler-gear,carried by the lever-arm, and driven by said pinion;variable-speed gearing with any member ot which vthe idler may beengaged; and a series of pins equal in number to the elements ot thevariable-speed gearing` and each. being marked to indicate the number olteeth in the various members of said gears with any of which said idlermay be shifted to engage.

In testimony whereof' I allix my signature, in presence ot twowitnesses, this 2l st day ol' lJune, 1906.

BENGT M. XV. HANSGN.

Witnesses:

` KATHRYN T. M. OCONNELL,

HENRY L. HUNTINGTON.

sie

